iPad will not go to sleep while using Kindle app

Hi Sam Brennan,

If you have your Auto-Lock Setting set to anything other than Never under Settings > Display & Brightness > Auto-Lock and the iPad stays on while using the Kindle app, there might be a setting for the Kindle app. Since this is an Amazon app, please reach out to their support as they would be able to guide you with more accuracy while using the Kindle app: Kindle E-Reader Help - Amazon Customer Service

Take care.

You can find these steps along with other information that may be helpful, here: 

If you have followed the steps correctly and you still have the issue, let us know if you get any specific alerts or error messages when trying, as those may help us determine what might be causing the issue.

We also recommend restarting your device and keeping it updated as those steps assure you have cleared out any minor software issues and are running the most current version.

Restart your iPhone - Apple Support

Update your iPhone or iPad - Apple Support

If you still have questions, reach out to Apple Support directly, as this may require closer guidance: Get Support

Cheers!